Jack, thanks for the additional detail. I'm just a few weeks away form putting your post to practice
Just two easy questions:
The reduced guide and boss look like a must do for maximum performance applications. It really opens up the port. But for a street application where a person seeks additional performance, but also wishes longevity of the engine, could any significant gains be obtained by profiling the boss area around the stock valve guide? I was considering keeping the guide at stock length to help shield heat off the valve stem. I wouldn't mind giving up a little performance in trade.
The second question has to do with the #9 photo. Just where does that sleeve thingy fit
MAAAAN Jack, She's lookin GOOD! I've been wondering which product you use for the thermal barrier, the c-kote or the ceramic fill? My guess is the c-kote. (Hope that's not a proprietary secret) :-) I was thinking about ordering some c-kote for the pistons. Applying it to the valves makes sense too. I assume you apply to the whole valve, stem and all for best effect then. I might be showing off my iggerance here, but what about the combustion chamber too, and maybe the exhaust ports? Thanks for the awesome work Jack! You Da man.
I use single cut burrs (usually used on steel) as they slow down cutting compared to Alumihoggers. They tend to clog more easily but if you use Crisco or similar as cutting lube its not too bad. (and cheap ;D) I shorten them from 6" to about 4.5" as it gives better control. I also buy the 3" long for 'roughing out'. Favorite are 3/8" rounded tree and 3/8" pointed tree shapes, but I also use 1/4" ball end and tree shapes plus 14.5degree taper cutters with rounded nose. Couple of different manufacturers, see pic. PJ
There are three types of people in the world, those who can count and those who can't I dabble in rocket science, when I'm not picking my nose
I have a variety of cutters that I purchase from Matco Tools for the life time replacement But I prefer the straight cutters to work out the rough casting flaws in the pockets, opening up the cross sectional area of the spigot and pre-shaping the guide bosses but for my final shape I'll go through a few boxes of abrasive rolls. I get the abrasives rolls through Standard Abrasives cuz they'll custom make the grit I prefer or get'em through Merit. I usually just dip the cutter tips in transmission fluid to prevent clogging up and hit the trigger to spin off the excess fluid.The cutters are 6 inches in length with 1/4 and 3/8 heads.............Jack
For all you DIY who wish to port your heads all linked images will lost sometime at the end of February or the beginning or March. I simply don't use Photo Buckets anymore or any site to host my pictures and have no back up system for the images. I signed one more time on PBs to keep the images up for ninety days,after that they will be lost,just giving you a heads up to start coping this information.
Just to add a extra note to this thread, on the roof and guide boss, remove little as possible in the roof and ROUND profile the guide boss,depending what's available in the floor will depend how the roof gets worked and turned,you're better off just keeping it simple to avoid the mistake of removing to much and slowing down port velocity.
r80rt: :)This is a splendid write up, THANK YOU!!!!
Dec 26, 2015 16:54:05 GMT -5
mashermoto: What the what is this shoutbox for? Or should I shout, WHAT THE WHAT IS THIS SHOUTBOX FOR!
May 12, 2016 22:22:21 GMT -5
motormike: Good Day ...just a FYI.. Wild Cat is this Labor Day weekend. Still go'n on. A few 650's still make the scene. Various rides at different skill levels each day.. awards dinner sunday eve. BS in the park'n lot after dinner.
Aug 23, 2016 7:57:01 GMT -5
lsettle: First post in over 6 years!
Aug 28, 2016 19:45:17 GMT -5
kardon: Wow quiet here, where did they all go.
Oct 7, 2016 2:18:13 GMT -5
gggGary: XS650.com LOL
Feb 16, 2017 20:49:02 GMT -5
buell88: Anybody have any idea who built the xs650 tracker used in the Draggin Jeans Ad on Pipeburn?
May 16, 2017 16:24:09 GMT -5
joshua: The regulator/rectifier unit I got from Mikes PMA has closer hole spacing than original. Are we supposed to mill the holes to fit?
Jun 7, 2017 19:25:58 GMT -5
joshua: My bad. I found the bracket they supplied to mount the rectifier/regulator... Uh oh. How is this meant to work? Which way is it meant to mount? Looks like I have to use some spacers or something. Good instructions would be nice.
Jun 7, 2017 22:09:52 GMT -5
craig8johnson: Not sure if this is the right spot or not but oh well...
Jul 11, 2017 18:04:15 GMT -5
craig8johnson: I'm checking the charging system. I'm afraid I might have fried the last battery. With the solid state regulator (after market) what should it be charging at. The book says, I think, 15 volts. I'm hitting 17 when revved. Is that too high?
Jul 11, 2017 18:06:19 GMT -5
gggGary: Yes 17 volts is too high, about 14 volts is max, sounds like you don't have the right regulator or it's wired wrong.
Jul 13, 2017 6:54:33 GMT -5
dean: Just saying Hello, new member who is going to fix up a 79 XS650 that has seen its better days. I will definitely have lots of questions coming up.
Jun 23, 2018 16:45:32 GMT -5
tt650: Trying to breathe life into a 1980 that's been stored (indoors) for 25 yrs. Air filters are dry rotted. Have cleaned carbs but she only runs briefly on choke then stops. Need jet setting info and other ideas that might help her idle and rev.
Jul 3, 2018 19:15:19 GMT -5
trix13: Hey everyone! New to the forum and am fighting those gremlins!! New charging system, ignition switch, coil and fuse box. Resistance is higher than normal on the ignition pick up so I'm trying to find one. No such luck yet.
Aug 16, 2018 8:50:48 GMT -5
trix13: Also, even though all of my connections are clean, I cannot seem to find out why , when at higher rpms, I hit the signals and the rpms pulse with the signals...hahah. same with the brake light. I appreciate all input!!
Aug 16, 2018 8:55:08 GMT -5
bob99: how do I post a question. I am new to the forum
Jun 6, 2019 10:52:10 GMT -5
adlpc: Hello all! Been enjoying your edifying posts and discussions - and as a fan of the XS650 since my early teenage years happy that I now own a 1980 Special which I plan to turn into a vintage half faired racer. Thank you all for being here!
Oct 1, 2019 0:58:56 GMT -5
jimothyj: Hello everyone, I just joined & wish would have known about this site in 2014 when I brought my 1974 TX650A back from the grave. I have spent a good deal of $$ and alot of time on it. Just painted it and working on electrical, I will post pics soon,
Apr 10, 2021 2:14:13 GMT -5
louisvan: trix13 - I had a problem with my 1975 SX650. When I got to highway speeds, the engine lost power. The problem was in the connectors. At a certain vibration and the wind pushing on the wiring loom, the connector lost continuity. A bad crimp to the wire.
May 20, 2021 1:19:09 GMT -5